Sierra Wireless SyncMaster 800TFT User manual

COLOR MONITOR

SyncMaster 800TFT

(Toshiba Panel)

Manual

SERVICE

COLOR MONITOR CONTENTS

1. Precautions

2. Product Specifications

3. Disassembly & Reassembly

4. Alignments & Adjustments

5. Troubleshooting

6. Exploded View & Parts List

7. Electrical Parts List

8. Block Diagram

9. Wiring Diagram

10. Schematic Diagrams

1-1-1 Warnings

1. For continued safety, do not attempt to modify the

circuit board.

2. Disconnect the AC power and DC power jack

before servicing.

1-1-2 Servicing the LCD Monitor

1. When servicing the LCD Monitor, Disconnect the

AC line cord from the AC outlet.

2. It is essential that service technicians have an

accurate voltage meter available at all times. Check

the calibration of this meter periodically.

1-1-3 Fire and Shock Hazard

Before returning the monitor to the user, perform the

following safety checks:

1. Inspect each lead dress to make certain that the

leads are not pinched or that hardware is not

lodged between the chassis and other metal parts in

the monitor.

2. Inspect all protective devices such as nonmetallic

control knobs; insulating materials; cabinet backs;

adjustment and compartment covers or shields;

isolation resistor-capacitor networks; mechanical

insulators, etc.

3. Leakage Current Hot Check (Figure 1-1): WARNING:

Do not use an isolation transformer during this test.

Use a leakage current tester or a metering system

that complies with American National Standards

Institute (ANSI C101.1, Leakage Current for

Appliances), and Underwriters Laboratories (UL

Publication UL1410, 59.7).

Figure 1-1. Leakage Current Test Circuit

4. With the unit completely reassembled, plug the AC

line cord directly into a 120V AC outlet. With the

unit’s AC switch first in the ON position and then

OFF, measure the current between a known earth

ground (metal water pipe, conduit, etc.) and all

exposed metal parts, including: metal cabinets,

screwheads and control shafts. The current

measured should not exceed 0.5 milliamp. Reverse

the power-plug prongs in the AC outlet and repeat

the test.

1-1-4 Product Safety Notices

Some electrical and mechanical parts have special

safety-related characteristics which are often not

evident from visual inspection. The protection they give

may not be obtained by replacing them with

components rated for higher voltage, wattage, etc. Parts

that have special safety characteristics are identified by

on schematics and parts lists. A substitute

replacement that does not have the same safety

characteristics as the recommended replacement part

may create shock, fire and / or other hazards. Product

safety is under review continuously and new

instructions are issued whenever appropriate.

SyncMaster 800TFT 1-1

1 Precautions

Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards such as

electrical shock.

1-1 Safety Precautions

DEVICE

UNDER

TEST

TEST ALL

EXPOSED METAL

SURFACES

(READING SHOULD

NOT BE ABOVE 0.5mA)

LEAKAGE

CURRENT

TESTER

2-WIRE CORD

*ALSO TEST WITH

PLUG REVERSED

(USING AC ADAPTER

PLUG AS REQUIRED)

EARTH

GROUND

!

1-2-1 General Servicing Precautions

1. Always unplug the unit’s AC power cord from the

AC power source and disconnect the DC power

jack before attempting to:

(a) remove or reinstall any component or assembly.

(b) disconnect PCB plugs or connectors.

(c) connect a test component in parallel with an

electrolytic capacitor.

2. Some components are raised above the printed

circuit board for safety. An insulation tube or tape

is sometimes used. The internal wiring is

sometimes clamped to prevent contact with

thermally hot components. Reinstall all such

elements to their original position.

3. After servicing, always check that the screws,

components and wiring have been correctly

reinstalled. Make sure that the area around the

serviced part has not been damaged.

1. Immediately before handling any semiconductor

components or assemblies, drain the electrostatic

charge from your body by touching a known earth

ground. Alternatively, wear a discharging wrist-

strap device. To avoid a shock hazard, be sure to

remove the wrist strap before applying power to

the monitor.

2. After removing an ESD-equipped assembly, place it

on a conductive surface such as aluminum foil to

prevent accumulation of an electrostatic charge.

3. Do not use freon-propelled chemicals. These can

generate electrical charges sufficient to damage

ESDs.

4. Use only a grounded-tip soldering iron to solder or

desolder ESDs.

5. Use only an anti-static solder removal device. Some

solder removal devices not classified as “anti-static”

can generate electrical charges sufficient to damage

ESDs.

4. Check the insulation between the blades of the AC

plug and accessible conductive parts (examples:

metal panels, input terminals and earphone jacks).

5. Insulation Checking Procedure: Disconnect the

power cord from the AC source and turn the power

switch ON. Connect an insulation resistance meter

(500 V) to the blades of the AC plug.

The insulation resistance between each blade of the

AC plug and accessible conductive parts (see

above) should be greater than 1 megohm.

6. Always connect a test instrument’s ground lead to

the instrument chassis ground before connecting the

positive lead; always remove the instrument’s

ground lead last.

6. Do not remove a replacement ESD from its

protective package until you are ready to install it.

Most replacement ESDs are packaged with leads

that are electrically shorted together by conductive

foam, aluminum foil or other conductive materials.

7. Immediately before removing the protective

material from the leads of a replacement ESD,

touch the protective material to the chassis or

circuit assembly into which the device will be

installed.

Caution: Be sure no power is applied to the

chassis or circuit and observe all

other safety precautions.

8. Minimize body motions when handling

unpackaged replacement ESDs. Motions such as

brushing clothes together, or lifting your foot from

a carpeted floor can generate enough static

electricity to damage an ESD.

1 Precautions

1-2 SyncMaster 800TFT

1-3 Electrostatically Sensitive Devices (ESD) Precautions

Some semiconductor (solid state) devices can be easily damaged by static electricity. Such components are commonly

called Electrostatically Sensitive Devices (ESD). Examples of typical ESD components are integrated circuits and some

field-effect transistors. The following techniques will reduce the incidence of component damage caused by static

electricity.

1-2 Servicing Precautions

WARNING: An electrolytic capacitor installed with the wrong polarity may explode.

Caution: Before servicing units covered by this service manual, read and follow the Safety Precautions

section of this manual.

Note: If unforeseen circumstances create conflict between the following servicing precautions and any of the

safety precautions, always follow the safety precautions.

2 Product Specifications

2-1 Specifications

LCD Panel TFT-LCD panel, RGB vertical stripe, normally white transmissive,

18-Inch viewable, 0.28 mm pixel pitch

Scanning Frequency Horizontal : 30 kHz to 81 kHz (Automatic)

Vertical : 56 Hz to 85 Hz (~XGA), 76 Hz (SXGA)

Display Colors 16.7 Million colors

Maximum Resolution Horizontal : 1280 Pixels @ 81 kHz

Vertical : 1024 Pixels @ 76 Hz

Input Video Signal Analog, 0.714 Vp-p ± 5% positive at 75 Ω, internally terminated

Input Sync Signal Type: Seperate H/V sync, Composite H/V, Sync-on-Green

Level: TTL level (V high ≥ 2.0 V, V low ≤ 0.8 V), Sync-on-Green (≤ –0.25 V)

Maximum Pixel Clock rate 135 MHz

Active Display 359 ± 3 mm /

Horizontal/Vertical 287.2 ± 3 mm

AC power voltage & Frequency AC 90 to 264 Volts, 60/50 Hz ± 3 Hz

Power Consumption 54 W (max.), 48W (norminal)

Dimensions

Unit (W x D x H) 17.7 x 18.2 x 7.2 Inches (449.4 x 461.2 x 182 mm)

Carton (W x D x H) 22.4 x 11.6 x 22.8 Inches (570 x 295 x 580 mm)

Weight

(Net/Gross) 8.3 kg (18.28 lbs) / 11.8 kg ( 20.0 lbs)

Environmental Considerations Operating Temperature : 50°F to 104°F (10°C to 35°C)

Humidity : 10 % to 80 %

Storage Temperature : -68°F to 113°F (-20°C to 45°C)

Humidity : 5 % to 95 %

• SyncMaster 800TFT complies with SWEDAC (MPR II) recommendations for reduced electromagnetic fields.

• Designs and specifications are subject to change without prior notice.

SyncMaster 800TFT 2-1

Item Description

2 Product Specifications

2-2 SyncMaster 800TFT

2-2 Pin Assignments

Sync

Type

Pin No.

15-Pin D-Sub & 13W3 Signal Cable Connector

Separate Composite

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

Red

Green

Blue

GND

DDC Return (GND)

GND-R

GND-G

GND-B

No Connection

Self Raster

GND

Bi-Dr Data (SDA)

H-Sync

V-Sync

DDC Clock (SCL)

Red

Green

Blue

GND

DDC Return (GND)

GND-R

GND-G

GND-B

No Connection

Self Raster

GND

Bi-Dr Data (SDA)

H/V-Sync

Not Used

DDC Clock (SCL)

Red

Green + H/V Sync

Blue

GND

DDC Return (GND)

GND-R

GND-G

GND-B

No Connection

Self Raster

GND

Bi-Dr Data (SDA)

Not Used

DDC Clock (SCL)

13W3

A1

A2

A3

4

A1-GND

A2-GND

A3-GND

3, 8

10

4

6

5

7

1, 2

Sync-on-green

2 Product Specifications

SyncMaster 800TFT 2-3

QRS

P

O

Video

Sync

Horizontal

Vertical

CDE

P

O

B

A

Video

Sync

Separate Sync

2-3 Timing Chart

This section of the service manual describes the timing that the computer industry recognizes as standard

for computer-generated video signals.

C D

A

O

E

B

P

Video

Sync

Video

Q R S

A : Line time total B : Horizontal sync width O : Frame time total P : Vertical sync width

C : Back porch D : Active time Q : Back porch R : Active time

E : Front porch S : Front porch

VIDEO

A

B

O

P

Q

R

S

Horizontal

Vertical

B

Green

Vertical

P

Q

R

S

O

Horizontal

H/V Composite Sync

Sync-on-Green

79.976

12.504

1.067

1.837

9.481

0.119

75.025

13.329

0.038

0.475

12.804

0.013

135.000

Positive

Separate

81.129

16.640

6.400

2.880

3.200

76.106

10.660

0.080

3.200

0.020

135.000

Negative

Com.

68.677

14.561

1.016

2.201

10.836

0.508

84.997

11.765

0.044

0.524

11.183

0.015

94.500

Positive

Separate

1024/85Hz

1024x768

1280/76Hz

1280x1024

1280/75Hz

1280x1024

1024/75Hz

1024 x 768

60.023

16.660

1.219

2.235

13.003

0.203

75.029

13.328

0.050

0.466

12.795

0.017

78.750

Positive

Separate

31.469

31.777

3.813

1.589

26.058

0.318

70.087

14.268

0.064

0.858

13.155

0.191

28.322

Negative

Positive

Separate

fH (kHz)

A µsec

B µsec

C µsec

D µsec

E µsec

fV (Hz)

O msec

P msec

Q msec

R msec

S msec

Clock

Freq.

(MHz)

Polarity

H.Sync

V.Sync

Remark

IBM

640/75 Hz

640 x 480

640/85 Hz

640 x 480

800/75 Hz

800 x 600

800/85 Hz

800 x 600

1024/60Hz

1024 x 768

VGA2/70 Hz

720 x 400

VGA3/60 Hz

640 x 480

Table 2-1. Timing Chart

31.469

31.778

3.813

1.589

26.058

0.318

59.940

16.683

0.064

0.794

15.761

0.064

25.175

Negative

Separate

37.500

26.667

2.032

3.810

20.317

0.508

75.000

13.333

0.080

0.427

12.800

0.027

31.500

Negative

Separate

43.269

23.111

1.556

2.222

17.778

1.556

85.008

11.764

0.671

0.578

11.093

0.023

49.500

Negative

Separate

46.875

21.333

1.616

3.232

16.162

0.323

75.000

13.333

0.064

0.448

12.800

0.021

49.500

Positive

Separate

53.674

18.631

1.138

2.702

14.222

0.569

85.061

11.756

0.056

0.503

11.179

0.019

56.250

Positive

Separate

48.363

20.677

2.092

2.462

15.754

0.369

60.004

16.666

0.124

0.600

15.880

0.062

75.000

Negative

Separate

Mode

VESA

Timing

2 Product Specifications

2-4 SyncMaster 800TFT

Memo

3-1-1 Removing the Stand

1. Remove 4 screws on the Stand.

3-1-2 Main Body Disassembly

1. Remove 4 screws on the Rear Cover.

2. Pull the Rear Cover up and off the monitor.

3. Remove 4 screws on the BRKT-VESA and

Remove the BRKT-VESA.

4. Remove 16 screws on the PCB Shield and

remove the Shield.

5. Remove 7 screws on the Main PCB and 2

screws on the Inverter PCB and 2 screws on

the 10P Harness.

6. Disconnect the connector (140P) between the

Panel and the CN600 connector on the Main

PCB.

7. Disconnect the Function PCB wire (10P)

between the Function PCB and the CN102

connector on the Main PCB.

8. Disconnect 2 Inverter wires between the Panel

and the CN2, CN3 connectors on the Inverter

PCB.

9. Disconnect the 12P harness between CN1

connectors on the Inverter PCB and CN103

connector on the Main PCB.

10. Carefully lift the Main PCB Assembly and

Inverter PCB and place them on a flat, level

surface that is protected from static electricity.

11. Remove 10 screws on the PCB Bracket.

12. Remove the Bracket Assembly from the Front

Cover.

13. Remove the 2 screws on the Function PCB

from the Front Cover and remove the

Function PCB and Function Knob.

SyncMaster 800TFT 3-1

3 Disassembly and Reassembly

This section of the service manual describes the disassembly and reassembly procedures for the

SyncMaster 800TFT TFT-LCD monitor.

WARNING: This monitor contains electrostatically sensitive devices. Use caution when handling

these components.

3-1 Disassembly

Cautions:1. Disconnect the monitor from the power source before disassembly.

2. Follow these directions carefully; never use metal instruments to pry apart the cabinet.

3-2 Reassembly

Reassembly procedures are in the reverse order of Disassembly procedures.

Memo

3 Disassembly and Reassembly

3-2 SyncMaster 800TFT

SyncMaster 800TFT 4-1

4 Alignments and Adjustments

This section of the service manual explains how to use the DDC JIG to adjust the black, red, green, and blue

levels of the FPD when you replace the AD Board, and how to update the microprocessor when you

change the Panel or Lamp(s).

4-1 Required Equipment

The following equipment is necessary for adjusting the monitor:

• Oscilloscope with probe tool

• Computer with Windows 95 , Windows 98 , or Windows NT .

• DV18AS.exe software

• DDC Control JIG

4-2 Using the DDC Control JIG

After replacing the LCD Panel, Lamp(s), and / or AD Board, use the DDC Control JIG to complete your

service. Attach the DDC Control JIG to the flat panel display (FPD) as shown in the diagrams, below.

MONITOR

INTERFACE

BOARD VER. 2.0

PC

SIGNAL

GENERATOR

3-WIRE

CABLE

SIGNAL CABLE

5V DC

ADAPTOR

PARALLEL CABLE

Figure 4-1. Setup 1, With Signal Generator

MONITOR

INTERFACE

BOARD VER. 2.0

PC

3-WIRE CABLE

SIGNAL CABLE

PARALLEL CABLE

D-SUB

CONNECTOR

5V DC

ADAPTOR

Figure 4-2. Setup 2, Without Signal Generator

R R R

4-2-1 Main Menu

4-2-1 (a) Service JIG : DV18

4-2-2 Sub Menu

4-2-2 (a) Panel Information

No Label Definition

4 Alignments and Adjustments

4-2 SyncMaster 800TFT

Monitor On Time

Total hours that the monitor has been actively

functioning.

Panel Cycle The total number of times the Panel has been

turned ON.

Time Total in Hours that this Panel or Lamp has been

ON. Reset this number to 000000 after

replacing the part.

Panel Total number of hours that this Panel has

been ON.

Lamp, Upper Total number of hours that this Upper Lamp

has been ON.

Lamp, Lower Total number of hours that this Lower Lamp

has been ON.

Change No. The number of times this Panel or Lamp has

been replaced. The numbers are 00 if the item

is the original factory part installed during

manufacture of this monitor.

Panel Replacement times. This value is 00 if original

equipment.

Lamp, Upper Replacement times. This value is 00 if original

equipment.

Lamp, Lower Replacement times. This value is 00 if original

equipment.

Message Shows the message.

Read Reads all Panel information data from the

AD Board

Write Writes the Panel Parameter Control values to the

AD Board

Read buffer Reload the Panel Parameter Control values from

the Program buffer

Return Main Returns to the Main menu

Figure 4-4. Control JIG Menu

Red max value Shows the red video signal max value

Green max value Shows the green video signal max value

Blue max value Shows the blue video signal max value

Red min value Shows the red video signal min value

Green min value Shows the green video signal min value

Blue min value Shows the blue video signal min value

Color Automatical screen contrast setting

Auto Adjustment

Red gain control Adjusts the red video signal gain control

Green gain control Adjusts the green video signal gain control

Blue gain control Adjusts the blue video signal gain control

Red cutoff control Adjusts the red video signal cutoff control

Green cutoff control Adjusts the green video signal cutoff control

Blue cutoff control Adjusts the blue video signal cutoff control

Panel information Shows the sub menu to panel information

(4-2-2 (a))

Scroll bar Changes the value or level of the selected

item. The window to the right shows the

value as it changes.

SAVE Saves the current adjustment value of

the R,G,B video contrast gain and

cutoff level

Setting Displays and allows you to adjust the

PC and Control JIG communication

environment. Use this button to change the

Delay parameter and Port Address of

your PC system and to test the connection

between the Control JIG and your computer

Exit Quits the DDC Control JIG

Figure 4-3.Service JIG Menu

1 2 3 4 5 6

7

8 9

10 11 12 13 14

15

16 17 18

a

b

d

e

f

k

c

g

h

i

j

n

o

l

m

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

a

b

c

d

e

f

g

h

i

j

k

l

m

n

o

4-2-3 Adjustment Procedures

Use the following procedures whenever you

replace the AD Board, Panel, or one or both of the

Lamps.

4-2-3 (a) When Replacing the AD Board

1. Before replacing the AD Board, read all Panel

information data by using the Read button on

the DDC Control JIG.

2. Remove the old AD Board and replace it with

a new board.

3. Perform the procedures described in section

4-2-3 (b).

4. Write the Panel information data to the new

AD Board by using the Write button.

5. Perform other procedures using the DDC

Control JIG, if necessary.

6. When all procedures are complete, select the

Exit button ( ) to quit the DDC Control JIG

software.

4-2-3 (b) Color Auto Adjustment

1. After displaying 16-Gray pattern or black and

white mixed pattern, click “Color Auto

Adjustment” button.

2. During normal execution of Auto Algorithm

the screen image may flicker. If Auto

Algorithm does not excute properly, check

DDC Control JIG.

3. After normal execution of Auto Algorithm,

confirm optimal settings by observing the

contrast of several different patterns on the

display.

4. If you want to check each color value, click the

button from to and from to

4-2-3 (c) When Replacing the Panel

1. Select the Read Buffer button ( ) to gather the

current information about this monitor.

2. Increment the number by clicking on the (+)

button on the Panel row in the Change No.

column. If they were not already 00, the

numbers for the Upper and Lower Lamps will

automatically change to 00.

3. Check all values. If there is an error, select

Read Buffer again and increment the Change

No. column to the correct number. When all

values are correct, select the Write button ( )

to record the data in the firmware.

4. Select the Return Menu button ( ) to Return

Main Menu.

4-2-3 (d) When Replacing the Upper and/or Lower Lamp

1. Select the Read Buffer button ( ) to gather

current information about this monitor.

2. Increment the number by clicking on the (+)

button on the Lamp Upper and/or Lamp

Lower row in the Change No. column.

3. Check all values. If there is an error, select

Read Buffer again and increment the Change

No. column to the correct number(s). When all

values are correct, select the Write button

( ) to record the data in the firmware.

4. Select the Return Menu button ( ) to Return

Main Menu.

4 Alignments and Adjustments

SyncMaster 800TFT 4-3

1

6 8 13

18

n

o

m

n

m

o

1. To display the Service Function OSD, push

and hold in for 8 seconds the Left and Right

arrow buttons on the front panel of the

monitor.

2. If the Panel has been replaced during this

servicing, use the Up or Down arrow button

on the front panel to highlight the Panel row

on the table. Increment the Change No. value

by pushing and holding in (for 8 seconds) the

Left and Right arrow buttons on the front

panel. Incrementing the Panel value

automatically changes both the Upper and

Lower Lamp Change No. value to 00.

If you have changed the Upper and/or Lower

Lamp(s) without changing the Panel, highlight

the appropriate row(s) then push and hold in

(for 5 seconds) both the Left and Right arrow

buttons on the front panel. This action

increments the Change No. value(s).

Note: Increment the Lamp value(s) only if one

or both of them were replaced,

but the Lamp was not replaced.

3. After incrementing the appropriate values,

power off the monitor.

4 Alignments and Adjustments

4-4 SyncMaster 800TFT

4-3 Using the OSD Service function

After replacement of the LCD Panel or Lamp(s), use the 800TFT’s OSD Service Function to complete your

service.

Monitor On Time

Panel Cycle

Panel

Lamp Upper

Lamp Lower

: 000049Hr

Service Function

: 000088

: 000050Hr 00

Time Change No.

Figure 4-5. Service Function Menu Screen

4 Alignments and Adjustments

SyncMaster 800TFT 4-5

SyncMaster 800TFT 5-1

5 Troubleshooting

Notes: 1. Before troubleshooting, set up the PC’s display as below.

• Resolution: 1280 x 1024

• H-frequency: 64 kHz

• V-frequency: 60 Hz

2. If no picture appears, confirm the power cord is correctly connected.

3. Check the following circuits.

• No raster appears: Stand PCB, Main PCB

• 12V develop but no screen: Main PCB

• 12V does not develop: Main PCB

4. If you push and hold the EXIT button for more than 5 seconds, the monitor automatically reverts back

to the factory preset

5-1 No Power

Does proper DC 12 V appear at

DC jack connected to CN101?

Check Power Adaptor.

Yes

No

Does proper DC 5 V appear at

Pin 4 of IC101?

Check IC101 and related circuit.

Check Q103, Q105 and Q106.

Yes

No

Does proper 5 V - signal appear at

Pin 42 of IC501 (SW_REG_EN)?

Check IC501 and related circuit.

(CN102, Function Key)

Yes

No

5 Troubleshooting

5-2 SyncMaster 800TFT

5-2 No Video

Check signal cable and connection.

Check TFT-LCD panel and Inverter.

Check IC201 and related circuit.

Does the outpus signal appear at RA403 and

R411 of IC406? (LDTGB, LVSYNCB, LHSYNCB,

LCKBB)

Is the output of Pins 1, 17 of IC501 High ?

Yes

No

Yes

No

Does the analog video signal appear at R211,

R212, R215? (BLUE, GREEN, RED)

(IC201)

Yes

Check IC201, IC206 and related

circuit.

Does the sync signal appear

at the output of Pin 14 of IC201and Pin 3 of IC 206 ?

(V-SYNC, H

*

V SYNC)

Yes

No

Check the related circuit for these

ports.

No

Check IC501 and related circuit.

No

Check IC501 and related circuit.

No

Check IC 300 and related circuit.

No

Does the input signal appear at the Pins 40, 41

of IC 300?

(PLL H

*

V MX

-

PDEN)

Yes

During power on-off does the input signal

appear at the Pin 29,30 of IC300?

(AD

-

SDA, AD

-

SCL)

Do the clock and sync signal appear at Pin

115, 117 of IC 300?

(DCLKAB, MX_HSYNC) and does the digital video

signal appear at thr output port PDA, PDB)?

Yes

During power on-off dose the input signal

appear at the R 407 and R 408 ?

(MX

-

SDA, MX

-

SCL)

Yes

7 8

9 10

Check IC 406 and related circuit.

Yes

1 2 3 4

5 6

No

Check IC501 and related circuit

5 Troubleshooting

SyncMaster 800TFT 5-3

WAVEFORMS

4

CH1 RMS = 2.20V

5

CH1 RMS = 4.96V

6

CH1 RMS = 4.42V

8

CH1 RMS = 3.24V

9

CH1 RMS = 2.50V

2

CH1 RMS = 3.25V

3

CH1 RMS = 3.12V

7

CH1 RMS = 3.20V

10

CH1 RMS =960mV

1

CH1 RMS = 3.26V

5 Troubleshooting

5-4 SyncMaster 800TFT

Replace IC404.

Yes

No

There is video but no OSD.

5-3 No OSD

While pushing a front control

button does any pulse appear

at Pin 12 of IC404?

WAVEFORMS

Does input signal appear

at the Pins 2, 5 and

10 of IC404?

Check IC405 and related circuit.

Check IC404 and related circuit.

Yes

No

11 12 13

11

CH1 RMS = 4.18V

13

CH1 RMS = 3.26V

12

CH1 RMS = 3.26V

SyncMaster 800TFT 6-1

6 Exploded View and Parts List

6 Exploded View & Parts List

6-2 SyncMaster 800TFT

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